Free Republic
Browse · Search
News/Activism
Topics · Post Article

Skip to comments.

New device invisible to magnetic fields
Defense Talk ^ | 3/24/2012 | Defense Talk

Posted on 03/24/2012 11:19:51 PM PDT by U-238

European researchers said Thursday they have created a device invisible to a static magnetic field that could have practical military and medical applications.

Fedor Gomory and colleagues in Slovakia and Spain designed a cloak for a direct current, or dc, magnetic field that is static and produced by a permanent magnet or coil carrying a direct current.

DC magnetic fields are used in MRI imaging devices, in hospitals and in security systems, such as those in airports.

The researchers' device, described in a study in Friday's edition of the journal Science, features a cylinder with two concentric layers. While the inner layer consists of a superconducting material that repels magnetic fields, the outer layer is a ferromagnetic material that attracts them.

Placed in a magnetic field, the device has no effect on the field lines, showing neither a shadow nor a reflection. So an object inside the device cannot be detected.

"There are many applications -- for some cars, ships or a submarine," said study co-author Alvaro Sanchez of the Autonomous University of Barcelona.

He told AFP the device could also be used for patients who have a pacemaker and need a MRI of a knee or other body part, so the image would not be distorted.

Because it is made from commercially available materials, as well as operating under relatively strong magnetic fields and relatively warm liquid nitrogen temperatures, the device could easily be put to practical use, according to the authors.

"For the submarine, you have to make a shell around the submarine that will make the submarine magnetically undetectable," said Sanchez.

"This could also be used to protect some (military and medical) equipment against electromagnetic disturbances."

(Excerpt) Read more at defencetalk.com ...


TOPICS: Foreign Affairs; News/Current Events; Technical
KEYWORDS: cloak; electromagnetic; magneticfield; miltech; physics; submarine
Navigation: use the links below to view more comments.
first previous 1-2021-27 last
To: U-238

Degaussng technology has been around for 70 years.


21 posted on 03/25/2012 5:21:53 AM PDT by SampleMan (Feral Humans are the refuse of socialism.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238
operating under relatively strong magnetic fields and relatively warm liquid nitrogen temperatures

Compared to liquid helium, yes. In the real world, it's still close to -200 °C.

22 posted on 03/25/2012 6:30:44 AM PDT by Moltke (Always retaliate first.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: TigersEye

No problem! I bet you are plenty cool under that overcoat! ;-)


23 posted on 03/25/2012 9:09:09 AM PDT by TXnMA ("Allah": Satan's current alias...)
[ Post Reply | Private Reply | To 9 | View Replies]

To: TigersEye

Ah ha!

(sounds a bit like Mormon underwear :)


24 posted on 03/25/2012 10:37:43 AM PDT by MindBender26 (New Army SF and Ranger Slogan: Vengeance is Mine, sayeth the Lord.... but He subcontracts!)
[ Post Reply | Private Reply | To 16 | View Replies]

To: roadcat

Good to know, good to know. ;-)


25 posted on 03/25/2012 8:58:52 PM PDT by TigersEye (Life is about choices. Your choices. Make good ones.)
[ Post Reply | Private Reply | To 17 | View Replies]

To: Smokin' Joe

There is no think tank comparable to Free Republic!


26 posted on 03/25/2012 9:00:45 PM PDT by TigersEye (Life is about choices. Your choices. Make good ones.)
[ Post Reply | Private Reply | To 18 | View Replies]

To: MindBender26; TXnMA
(sounds a bit like Mormon underwear :)

Sort of but more like Vulcan underwear and I'm the coolest cat in town
when I'm out and about in it.

27 posted on 03/25/2012 9:08:31 PM PDT by TigersEye (Life is about choices. Your choices. Make good ones.)
[ Post Reply | Private Reply | To 24 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-27 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
News/Activism
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson